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Improved droop control based on virtual reactance for battery cycle life equalisation management in microgrid

Improved droop control based on virtual reactance for battery cycle life equalisation management in microgrid

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In microgrid with distributed energy storage, the line reactance of each distributed energy resource (DER) is not same due to their different distance far from the loads. This will lead to the ageing rate of every battery to be not consistent. Some of the batteries first appear ageing, the rest of the battery also quickly ages if these ageing batteries are not replaced in time. This will eventually make the whole microgrid cannot work properly. To solve this problem, the idea is inspired by V-shape formation of a flock of birds. The equalisation of line reactance between each DER is achieved through adopting improved droop control based on virtual reactance, and the equalisation of the cycle life of batteries is achieved by weighted factor for power rating method based on hierarchical control. Compared with the method without virtual reactance control, the cycle life of batteries is extended by 80% after using the proposed method.

http://iet.metastore.ingenta.com/content/journals/10.1049/iet-gtd.2017.1129
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